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Related Concept Videos

Autoimmune Disorders01:29

Autoimmune Disorders

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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The immune...
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Myasthenia Gravis ll: Pathophysiology01:22

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The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
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Myasthenia Gravis: Overview and Treatment01:20

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Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
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Drug Toxicity: Allergic Reactions01:30

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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Chronic Inflammation: Introduction01:12

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Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...
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Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy
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Sustained autoimmune mechanisms in dermatomyositis.

Steven A Greenberg1

  • 1Brigham and Women's Hospital, Department of Neurology, and Children's Hospital Informatics Program, Harvard-MIT Division of Health Sciences and Technology, Harvard Medical School, Boston, MA, USA.

The Journal of Pathology
|April 2, 2014
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Summary

Dermatomyositis pathogenesis involves overproduction of type 1 interferon-inducible proteins. Chronic accumulation of these proteins may lead to tissue injury in this autoimmune condition.

Keywords:
dermatomyositisinnate immune systemtype 1 interferon

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Area of Science:

  • Immunology
  • Dermatology
  • Pathogenesis

Background:

  • Dermatomyositis is an autoimmune disorder impacting skin and muscles.
  • Its underlying causes are not fully understood.
  • A link to type 1 interferon pathways is emerging.

Purpose of the Study:

  • To explore the role of type 1 interferon-inducible proteins in dermatomyositis.
  • To elucidate mechanisms of protein accumulation and tissue damage.

Main Methods:

  • Analysis of gene transcripts and protein expression.
  • Investigation of cellular and molecular mechanisms.

Main Results:

  • Evidence suggests overproduction of type 1 interferon-inducible gene products.
  • Mechanisms for chronic protein accumulation identified.

Conclusions:

  • Type 1 interferon pathway dysregulation is implicated in dermatomyositis.
  • Sustained protein accumulation may drive tissue injury.